Thursday, 7 February 2019

sequences and series - Evaluate sumin=1nftyfracn2n

This is a homework question; I'm supposed to use power series to find the following sum: n=1n2n

I took the geometric series 11x=n=0xn
and differentiated and multiplied both sides by x to get x(1x)2=n=1nxn
I'm stuck because I'm not sure how to make the 12n
term appear.

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